21444022210051 has 4 divisors (see below), whose sum is σ = 24507453954352. Its totient is φ = 18380590465752.

The previous prime is 21444022210031. The next prime is 21444022210057. The reversal of 21444022210051 is 15001222044412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21444022210051 - 2⁹ = 21444022209539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21444022210057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1531715872140 + ... + 1531715872153.

It is an arithmetic number, because the mean of its divisors is an integer number (6126863488588).

Almost surely, 2^{21444022210051} is an apocalyptic number.

21444022210051 is a deficient number, since it is larger than the sum of its proper divisors (3063431744301).

21444022210051 is an equidigital number, since it uses as much as digits as its factorization.

21444022210051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3063431744300.

The product of its (nonzero) digits is 5120, while the sum is 28.

Adding to 21444022210051 its reverse (15001222044412), we get a palindrome (36445244254463).

The spelling of 21444022210051 in words is "twenty-one trillion, four hundred forty-four billion, twenty-two million, two hundred ten thousand, fifty-one".